Finding that out is not really easy, I think. Transfer software adds entries to the Exif data, and a program that shows all Exif data might give you a clue.
Or you open the jpg in a text editor - you will see a lot of weird characters, but also maybe a string that was added by the software, such as in my case, digiKam:
...^@^@digiKam-3.5.0^@Canon^@Canon EOS 5D Mark III^@H^@^@^@^A^@^@^@H^@^@^@^A^@^@^@digiKam-3.5.0^@2014:06:01 13:21:29^@...
After pure file transfer it does not contain the digiKam strings.
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